Service tray



FIG. 1 is a front perspective view of a service tray, illustrating our new Design;

FIG. 2 is a top view thereof;

FIG. 3 is a front elevational view thereof, the rear elevational view being a mirror image thereof;

FIG. 4 is a right end view thereof, the left end view being a mirror image thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a service tray, as shown and described. 